const establishedDatabase = require('src/database/database');

class SearchHistory {
   constructor(database) {
      this.database = database || establishedDatabase;
      this.queries = {
         'create': 'insert into search_history (search_query, user_name) values (?, ?)',
         'read': 'select search_query from search_history where user_name = ? order by id desc',
      };
   }

   /**
   * Retrive a search queries for a user from the database.
   * @param {User} user existing user
   * @returns {Promise}
   */
   read(user) {
      return this.database.all(this.queries.read, user.username)
         .then(rows => rows.map(row => row.search_query));
   }

   /**
   * Creates a new search entry in the database.
   * @param {User} user a new user
   * @param {String} searchQuery the query the user searched for
   * @returns {Promise}
   */
   create(user, searchQuery) {
      return this.database.run(this.queries.create, [searchQuery, user.username])
         .catch((error) => {
            if (error.message.includes('FOREIGN')) {
               throw new Error('Could not create search history.');
            }
         });
   }
}

module.exports = SearchHistory;